Boring cartridge for piston rings



Jan. 20, 1942. H. M. OLSON 7 BORING CARTRIDGE FOR PISTON RINGS Filed April 50, 1941 2 Sheets-Sheet 1 Ammeg g Jan. 20, 1942. H. M. OLSON I BORING CARTRIDGE FOR PISTON RINGS Filed April 30, 1941 2 Sheets-Sheet 2 Patented Jan. 20, 1942 2,270,548 BORING CARTRIDGE roa rrs'rom amcs Holly M. Olson, Muskegon, Micli., assignor to Sealed Power Corporation, Muskegon, Mich., a

corporation of Michigan Application April 30, 1941, Serial No. 391,075

4 Claims.

This invention relates to a novel construction of divided cartridge for loading and holding piston rings for inside boring operations thereon, and to a method of loading said cartridge with piston rings.

In the manufacture of piston rings, after finishing the same at their outer curved surfaces and at their opposed flat sides, the interior is bored to make the cross sections of the rings uniform removing scale or so-called "skin" from the cast rings. In general previous practice has been to force the rings into a cylindrical cartridge. Such method is defective as it mars the finish and injures corners on'the rings; also the side pressure on the rings occurring from pushing or pulling the rings into the cartridge prevents the rings from properly conforming to the cartridge bore with the result that rings have uneven wall thicknesses when bored.

My invention and the method which is utilized and followed avoids these damaging efi'ects whereby when the rings are bored, a number of them at one operation, all rings are in a perfect condition withoutfinish mars or corner breakages and are of a uniform cross section.

The invention may be understood from the following description taken in connection with the accompanying drawings, in which,

Fig. 1 is a side elevation illustrating the manner in which the rings are loaded in the split cartridge.

Fig. 2 is an enlarged vertical section through the loading fixture, showing the split cartridge connected together after it has been loaded with rings.

Fig. 3 is a longitudinal central vertical section through the boring fixture on the lathe by means of which the boring is performed and the cartridge loaded with rings clamped in position.

Fig. 4 is a plan of the lower member of the fixture, and Fig. 5 is a transverse vertical section through l the boring cartridge with a load of rings therein on' the plane of line 55 of Fig. 3.

' Like reference characters refer to like parts in the different figures of the drawings.

.The loading cartridge which I have produced includes an upper and lower part. The lower part I is of substantially semi-cylindrical form and at opposite ends is provided with thickened ribs 2 and 3 respectively, each of which at its outer corner is beveled as at 4. At one end the member I is interiorly beveled as indicated at 5 (Fig. 3). At each end and at the upper side the walls of the lower half I of the boring cartridge are provided with semi-cylindrical grooves located at right angles to each other in which cylindrical short sections of rods 6 and I are located and permanently secured, the upper portions of which extend above the plane of the upper surfaces of the walls of the cartridge member 1. Two latching hooks 8 are pivotally mounted on pivot pins 9 near their lower ends, one at each side of and substantially midway between the ends of the cartridge member I and by means of an arc-shaped recess and a pin ID as shown are limited in swinging movement. The intermediate portion of the lower cartridge member I is strengthened and reinforced by a radially extending rib l I cast integral therewith.

The upper cartridge member I! is likewise-of a semi-cylindrical form with similar thickened ribs 2a and 3a at its ends similarly beveled as shown at 4a and interiorly beveled at one end at, 5 the same as in the previously described lower cartridge member. At the ends and at the upper portion of the ribs 2a horizontal grooves 13 of triangular form are out. At eachside a headed pin N is provided to be engaged by the latching hooks 8 when the two cartridge members are properly located one over the other. At the under sides of the upper semi-cylindrical cartridge member, grooves are made for reception of the upper portions of the rods 6 and I when the two cartridge members are brought together, thereby properly locating them with respect to each other. A similar strengthening and reinforcing rib Ha is provided, at the middle portion of which it is enlarged to provide a boss l5 interiorly threaded downwardly from its open upper end for the detachable connection of the handle it which has a downwardly extended threaded shank (Fig. 3) to be screwed thereinto.

The lower cartridge member I is placed in a loading block I! which at its upper side has a semi-cylindrical trough to receive the member I. A plurality of rings l8 finished except for the interior boring operation are laid in the cartridge member I (Fig. 1). Said rings normally open at their parting, when free and uncontracted' will have a larger exterior diameter than the interior diameter of the member I as shown in Fig. 1. A lever V I9 is pivotally mounted at 20 at one side of the block I! and at its upper end is provided with a curved holder 2| with a concave recess at its under side in which the upper cartridge member I2 is located. It is held in place by levers 22 pivotally mounted at 23 one at each side of the part 2 l the lower ends 'of the levers being equipped with pointed pro- Y shaped grooves iections or hooks which enter the triangular l3. Spring actuated friction brakes at 24 engage against the levers 22 as shown in Fig. 2 to normally hold them in positions to which moved.

By swinging the lever I9 in a clockwise direction by any suitable means which may be used, the upper member I 2 is brought against the rings l8 which are thereupon contracted and closed at their partings. The recessed under edge portions of the upper member l2 come into cooperative conjunction with the short rods 6 and 1 thereby properly locating the cartridge members I and I2 with respect to each other. The hooks 8 are then turned into their operative latching position to engage with the pins l4 as in Fig. 2. The part 2| is divided so as to provide two spaced apart sections as shown in Fig. 2 permitting the handle IE to be connected with the boss l5. Then by releasing the levers 22 and lifting the lever l9 to the position shown in Fig. 1 the cartridge with the rings therein is removed and taken to the boring lathe.

The lathe fixture in which the connected together two-part cartridge loaded with rings is placed, includes a base 25 at one end of which is a vertical member 26 provided with an annular beveled surface 21, at the other end a guide sleeve 28 is provided having spaced apart upwardly extending lugs 29 at its upper side. A rock shaft 30 is rotatably mounted in and through said lugs and carries a cylinder 3| with a spiral groove 32 cut therein. The shaft may be rocked by a handle 33. Within the guide sleeve 28 a hollow sleeve 34 is mounted for longitudinal movement. It has a headed screw 35 the head of which is received in the spiral groove 32 whereby on rocking the shaft 30 the sleeve 34 may be moved longitudinally in either direction depending upon the direction of rocking the shaft.

The loaded cartridge carried by the handle I6 is placed with the end having the ribs 2 and 2a to bring their beveled parts 4 and 4a against the beveled surface 21 of the part 26. The sleeve 34 being retracted to the right, the other end of the cartridge is brought into substantial alinement with said sleeve whereupon said sleeve is moved to the left. Its open end is provided with an interiorly beveled surface 34a to engage the beveled surfaces 4 and 4a on the ribs 3 and 3a, securely clamping the cartridge in place and properly centering it.

Within the inner end portion of the sleeve a cylinder 35 having a thin wall and an exterior diameter slightly less than the interior diameter of the cartridge has its outer end coming against the end ring l8 within the cartridge. At its outer end the cylinder 36 is provided with an annular enlargement 31 between which and adjacent portions of the sleeve 34 coiled springs without marring their finished surfaces.

ing operation.

With this construction .of loading cartridge and method of operation the rings finished except at their inner sides are closed or very nearly closed at their partings and are held in such position within the cartridge. A quantity or gang of rings may thus be closed at their partings The outer curved surfaces of the rings conform to the inner curved surfaces of the cartridge members which are carefully machined to the desired outer diameter of the rings. There is no pushing or pulling of rings into one end of a solid cartridge with danger of finish marring and injury to the corner of the rings; The rings when bored are snugly held in proper position in conformity to the cartridge bore whereby when therings have been interiorly bored all have uniformity in dimensions. The superiority of the product obtained and the avoidance of rejects is a valuable result of my invention.

The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure and of the method or its equivalents defined therein.

Iclaim:

1. A piston ring cartridge comprising, a semicylindrical lower member having a longitudinal semi-cylindrical recess at its upper portion, the radius curvature of which is substantially that of a cylinder in which piston rings are to be used, a second like cartridge member located over the first member in an inverted position, securing means mounted on one of the members and adapted to be releasably connected with the other of said members for connecting them together and holding them from separation, whereby a plurality of piston rings finished except at their interior curved surfaces may be clamped in side by side relation within the cartridg and substantially closed at their partings to substantially the form which they take when in use 3B are mounted, the action of which is to normally move the cylinder 36 until stopped by engagement of the annular rib 31 with the stop ing 39. Therefore, when sleeve 34 is moved to the left to engage with the loaded cartridge the outer end of the cylinder 36 comes against the end ring and in the continuation of movement of the sleeve 34 springs 38 are compressed putting the rings l8 under side compression and bringing the opposite end ring against the vertical member 26 and around the opening therethrough as shown in Fig. 3.

The boring bar 40 driven by the lathe is equipped with a boring cutter 4|. The boring bar may be fed through the rings so as to bore in an engine cylinder, and said cartridge members at each end being provided with annular outwardly extending ribs, the outer end corner portions of which are cut away to provide a continuous annular beveled surface around each end of the cartridge when the two cartridge members are connected together.

2. A piston ring cartridge comprising, a semicylindrical lower member having a longitudinal semi-cylindrical recess at its upper portion, the radius curvature of which is substantially that of a cylinder in which piston rings are to be used, a second like cartridge member located over the first member in an inverted position, securing means mounted on one of the members and adapted to be releasably comiected with the other of said members for connecting them together and holding them from separation, whereby a plurality of piston rings finished except at their interior curved surfaces may be clamped in side by side relation within the cartridge and substantially closed at their partings to substantially the form which they take when in use in an eneach end thereof having grooves thereon with rods therein extending thereabove and the other of the said cartridge members having complementary recesses to receive the rods to thereby properly and positively locate the cartridge members with respect to'each other against longitudinal or lateral movement.

3. A piston ring cartridge comprising, a semicylindrical lower member having a longitudinal semi-cylindrical recess at its upper portion,,the radius curvature of which is substantially that of a cylinder in which piston rings are to be used, a second like cartridge member located over the first member in an inverted position, securing means mounted on one of the members and adapted to be releasably connected with the other of said members for connecting them together and holding them from separation, whereby a plurality of piston rings finished except at their interior curved surfaces may be,

clamped in side by side relation within the cartridge and substantially closed at their partings to substantially the form which they take when in use in an engine cylinder, and the upper halfcartridge member at its upper side between its ends having a boss extending upwardly therefrom, said boss being downwardly bored and interiorly threaded, and a handle screwed into said boss whereby the cartridge -loaded with rings may be carried.

4. A piston ring cartridge comprising, a semicylindrical lower member having a longitudinal semi-cylindrical recess at its upper portion, the radius curvature of which is substantiallyflthat of a cylinder in which piston rings are to be used, a second like cartridge member located over the first member in an inverted position, securing means mounted on one of the members and adapted to be releasably connected with-the other of said members for connecting: them together and holding them from separation,

whereby a plurality of piston rings finished except at their interior curved surfaces may be clamped in side by side relation within the cartridge and substantially closedat their partings to substantially the'form which they take when in use in an engine cylinder, and said upper cartridge member at each end having thickened outwardly projecting annular rib portions, the ends of which near the upper sides thereof are provided with transverse grooves of triangular cross shape, having a substantially horizontal upper side and a downwardly and outwardly inclined side connecting therewith. HOLLY M, OLSON. 

